Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 234 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P1106: MAP SYSTEM PERFORMANCEDIAGNOSTIC PROCEDURE
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Diagnostic Procedure
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM.
- Start the engine. Monitor the Diagnostic Trouble Code (DTC) information with the scan tool. Is DTC P0108 or P1635 also set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
- Observe the MAP SENSOR parameter with the scan tool. Attempt to induce the fault that set the DTC by manipulating the MAP sensor wiring harness, the MAP sensor electrical connector, and the PCM connector. Is the MAP sensor voltage affected during any part of the test? If yes, go to next step. If no, go to step 8.
- Test the MAP sensor low reference circuit between the PCM and the MAP sensor for an intermittent open or for high resistance. Did you find and correct the condition? If yes, go to next step. If no, go to step 8.
- Test the MAP sensor signal circuit between the PCM and the MAP sensor for an intermittent short to voltage. Did you find and correct the condition? If yes, go to step 8. If no, go to next step.
- Test for an intermittent and/or poor connections at the MAP sensor. Did you find and correct the condition? If yes, go to step 8. If no, go to next step.
- Test for an intermittent and/or poor connections at the PCM. Did you complete the action? If yes, go to next step.
- Clear the DTCs with a scan tool. Turn off the ignition for 30 seconds. Start the engine and operate vehicle within the Conditions For Running DTC. You may also operate vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to step 2. If no, go to next step.
- Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
NOTE:
Disconnecting the PCM may eliminate the short during testing.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.